| 摘要 |
PROBLEM TO BE SOLVED: To secure a fixed distance between ultrasonic sensors, and to prevent a damage thereof. SOLUTION: In this ultrasonic flowmeter 10 having a passage pipe 11 wherein fluid flows, the ultrasonic sensors 12A, 12B arranged at a distance L in the axial direction of the passage pipe, and a case 13 for covering the ultrasonic sensors or the like, the flow rate of the fluid flowing in the passage pipe is measured from the difference of a propagation time of an ultrasonic wave through the fluid between the ultrasonic sensors. The case is equipped with a cylindrical part 17, and ends 18A, 18B blocking both sides of the cylindrical part, and penetrated by the passage pipe. A fixing mechanism 20 for fixing the passage pipe to the ends is provided inside the case. In the fixing mechanism, a ring-shaped deformable member 21 into which the passage pipe is inserted is pressed in the axial direction by a bolt 23 and deformed in the radial direction, and the deformed deformable member presses the circumference of the passage pipe and the ends of the case, to thereby fix the passage pipe to the ends. COPYRIGHT: (C)2007,JPO&INPIT
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